The former Transformers babe, the Star Trek beauty and the soccer stud are all currently towering half-naked above the city, thanks to billboards for their respective underwear ads—Fox and Ronaldo for Armani, and Saldana representing for Calvin Klein. Our predicton? Mass gawking that will make the Strip’s traffic congestion many times worse than usual.

But on to more pleasant ruminations—such as, who has the sexiest billboard? That’s where you come in. Check out the pics in our photo gallery and take our poll: Which skivvies-clad hottie wins this epic underwear showdown?